REPAIR TO ROOFS COVERING AND ROOF TREATMENT OF CERTAIN BLDGS IN TECHNICAL AREA AT AFS BHISIANA UNDER GE (AF) BHISIANA

Dismantling brick tiles or terracing tiles single layers on roof surfaces at height upto 15 meter, complete all as specified and directed by Engineer in Charge.

Demolition of mud phuska in roofs, any thickness including plastering/PCC padding and leaping (where full thickness removed or only a part thereof) complete all as specified and directed by Engineer in Charge.

Demolition of cement concrete of any description and in any position not otherwise specifically provided, complete all as specified and directed by Engineer in Charge.

Removing building materials/debris/aggregate/spoils etc to a distance of 400m, beyond the lead included in the rates, including loading, unloading and stacking at the destination complete all as specified and directed by Engr-in-Charge.

Material and labour of cutting grooves in brick wall 75mm wide and 65mm deep and shaping horizontal face of groove with and including cement mortar 1:3 complete all as specified and directed by Engineer in Charge.

Material and labour for roughening of roof surfaces by wire brushing and cleaning top surfaces of cement concrete, roof slab, including flashing and junction of parapets etc and brushing neat cement slurry with 3 kg of cement per sqm, complete all as specified and directed by Engineer in Charge.

Material and labour for providing PCC (1:2:4) type B-1 using 20 mm graded stone aggregate for providing slope, roof kerbs or mud stops rounded or chamfered edges on edges or roof padding mixed with WPC, complete all as specified and directed by Engineer in Charge.

Material and labour for plastering 10 mm thick in CM 1:4 mixed with WPC over cleaned concrete surfaces complete all as specified and directed by Engr-in-Charge. Note :1. WPC will be measured and paid separately under respective item. 2. WPC @ 200 ml per 50 kg of cement shall be provided

Supply only liquid water proofing compound, ISI marked, all as specified and directed by Engineer-in-Charge.

Material and labour for waterproofing treatment on slabs using a UV-stable, single-component, fibre-reinforced elastomeric liquid-applied waterproofing membrane formulated with PU hybrid polymers and reinforcing acrylic fibres, complete all as specified and directed by the Engineer-in-Charge. (a) Surface Preparation (i) The surface shall be free from loose paint, dust, dirt, grease, oil and other deleterious matter. Existing bituminous/bitumen coatings, if any, shall be completely removed. (iii) Cleaning shall be carried out by intensive wire brushing or high-pressure water jetting, or by any other approved method, to obtain a sound and clean substrate. (v) All cracks at corners, construction joints,honey combs, channels, parapets shall be properly treated with crack sealant or polymer- modified repair mortar. (b) Method of Application (i) Apply one self-priming coat (water as thinner & dilution 33% (3:1)) , ensuring uniform coverage over the prepared substrate. (ii) After the primer coat has dried adequately for approx 4-6 hours, apply the first coat of the undiluted waterproofing membrane uniformly by brush or roller. (iii) After an interval of 4 to 6 hours, apply the second coat of the undiluted waterproofing membrane uniformly by brush or roller, ensuring complete and even coverage. (iv) The waterproofing membrane shall be applied at an overall consumption of approximately 1 litre per 10 sq.ft. or as required to achieve the specified dry film thickness. (c) Technical Requirements: The liquid-applied waterproofing membrane shall be UV- and weather-resistant and shall possess a minimum positive hydrostatic pressure resistance of 10 bar, a minimum crack-bridging ability of 2.5 mm, excellent adhesion to concrete and masonry substrates, and excellent resistance to ageing and carbonation. NOTE: (i) No leakage or seepage shall be observed after a 72-hour ponding test. Any rectification required shall be carried out by the contractor at his own cost by repeating the above application procedure. (ii) The waterproofing system shall be executed by an authorised applicator of the approved manufacturer & certified by GE. The contractor shall provide the 10 years Company-backed waterproofing warranty/guarantee certificate upon successful completion of the work and prior to final payment. (iii)All materials/products used for the waterproofing system under this item shall be of Make: Asian Paints SmartCare Damp Proof Ultra system or equivalent approved waterproofing system of THERMAX, SIKA or FOSROC.